There is a momentary lapse in the OBD data stream while you're keying off and then on again. SG simply continues to use the latest data during that time. That's what a kill switch solves.
Setting it to hybrid mode keeps it alive and reading the stream, mph especially, for the duration of the engine-off coast. That's the only difference between Hybrid and Gas. There's really no reason to use Gas when the Hybrid mode is available.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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